As we all know, Apple wishes you'd chuck those old "Cheesegraters" in the recycling heap and buy something soldered and glued together.
They have thus been making life difficult for upgraders.
High Sierra requires that SIP be ENABLED during Web Driver Install. If you need it disabled for some reason, you can do that once the drivers are installed and running.
How to tell if it is ENABLED? Open terminal and type "csrutil status" and it will tell you.
If it is disabled you can either enable it by booting to recovery or just do a PRAM reset. If someone needs the procedure for enabling/disabling from Recovery and Google has failed you I can type it up.
Before you upgrade from 10.13 build 405 to 10.13.1 you would be best served to have driver 121 installed. This will avoid the dreaded "boot loop" problem.
If you update and see a white dock, look in "Security" center to see if there is a notification that the Nvidia driver has been blocked, obviously you need to "allow" it.
I got 10.13.1 running last night. How about everyone else?